Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
cua triet » cua viet, su triet, va triet
sach ky » sac ky, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
van bac » van bao, van hac, dan bac
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) tang xa hoi. hieu ((van bac) OR (van ban)) duc ban thanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) tang xa hoi. hieu ((van bac) OR (van ban)) duc ban thanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) tang xa hoi. hieu ((van bac) OR (van ban)) duc ban thanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) tang xa hoi. hieu ((van bac) OR (van ban)) duc ban thanh hai cua triet*.